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7c673cae FG |
1 | /* |
2 | * Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc. | |
3 | * | |
4 | * This file is part of Jam - see jam.c for Copyright information. | |
5 | */ | |
6 | ||
7 | /* This file is ALSO: | |
8 | * Copyright 2001-2004 David Abrahams. | |
20effc67 | 9 | * Copyright 2020 Nikita Kniazev. |
7c673cae FG |
10 | * Distributed under the Boost Software License, Version 1.0. |
11 | * (See accompanying file LICENSE_1_0.txt or | |
12 | * http://www.boost.org/LICENSE_1_0.txt) | |
13 | */ | |
14 | ||
15 | /* | |
16 | * timestamp.c - get the timestamp of a file or archive member | |
17 | * | |
18 | * External routines: | |
19 | * timestamp_from_path() - return timestamp for a path, if present | |
20 | * timestamp_done() - free timestamp tables | |
21 | * | |
22 | * Internal routines: | |
7c673cae FG |
23 | * free_timestamps() - worker function for freeing timestamp table contents |
24 | */ | |
25 | ||
26 | #include "jam.h" | |
27 | #include "timestamp.h" | |
28 | ||
29 | #include "filesys.h" | |
30 | #include "hash.h" | |
31 | #include "object.h" | |
32 | #include "pathsys.h" | |
f67539c2 | 33 | #include "jam_strings.h" |
7c673cae FG |
34 | #include "output.h" |
35 | ||
36 | ||
37 | /* | |
38 | * BINDING - all known files | |
39 | */ | |
40 | ||
41 | typedef struct _binding | |
42 | { | |
43 | OBJECT * name; | |
44 | short flags; | |
45 | ||
46 | #define BIND_SCANNED 0x01 /* if directory or arch, has been scanned */ | |
47 | ||
48 | short progress; | |
49 | ||
50 | #define BIND_INIT 0 /* never seen */ | |
51 | #define BIND_NOENTRY 1 /* timestamp requested but file never found */ | |
52 | #define BIND_SPOTTED 2 /* file found but not timed yet */ | |
53 | #define BIND_MISSING 3 /* file found but can not get timestamp */ | |
54 | #define BIND_FOUND 4 /* file found and time stamped */ | |
55 | ||
56 | /* update time - cleared if the there is nothing to bind */ | |
57 | timestamp time; | |
58 | } BINDING; | |
59 | ||
60 | static struct hash * bindhash = 0; | |
61 | ||
7c673cae FG |
62 | |
63 | #ifdef OS_NT | |
64 | /* | |
65 | * timestamp_from_filetime() - Windows FILETIME --> timestamp conversion | |
66 | * | |
67 | * Lifted shamelessly from the CPython implementation. | |
68 | */ | |
69 | ||
70 | void timestamp_from_filetime( timestamp * const t, FILETIME const * const ft ) | |
71 | { | |
72 | /* Seconds between 1.1.1601 and 1.1.1970 */ | |
73 | static __int64 const secs_between_epochs = 11644473600; | |
74 | ||
75 | /* We can not simply cast and dereference a FILETIME, since it might not be | |
76 | * aligned properly. __int64 type variables are expected to be aligned to an | |
77 | * 8 byte boundary while FILETIME structures may be aligned to any 4 byte | |
78 | * boundary. Using an incorrectly aligned __int64 variable may cause a | |
79 | * performance penalty on some platforms or even exceptions on others | |
80 | * (documented on MSDN). | |
81 | */ | |
82 | __int64 in; | |
83 | memcpy( &in, ft, sizeof( in ) ); | |
84 | ||
85 | /* FILETIME resolution: 100ns. */ | |
86 | timestamp_init( t, (time_t)( ( in / 10000000 ) - secs_between_epochs ), | |
87 | (int)( in % 10000000 ) * 100 ); | |
88 | } | |
89 | #endif /* OS_NT */ | |
90 | ||
91 | ||
92 | void timestamp_clear( timestamp * const time ) | |
93 | { | |
94 | time->secs = time->nsecs = 0; | |
95 | } | |
96 | ||
97 | ||
98 | int timestamp_cmp( timestamp const * const lhs, timestamp const * const rhs ) | |
99 | { | |
f67539c2 TL |
100 | return int( |
101 | lhs->secs == rhs->secs | |
7c673cae | 102 | ? lhs->nsecs - rhs->nsecs |
f67539c2 | 103 | : lhs->secs - rhs->secs ); |
7c673cae FG |
104 | } |
105 | ||
106 | ||
107 | void timestamp_copy( timestamp * const target, timestamp const * const source ) | |
108 | { | |
109 | target->secs = source->secs; | |
110 | target->nsecs = source->nsecs; | |
111 | } | |
112 | ||
113 | ||
114 | void timestamp_current( timestamp * const t ) | |
115 | { | |
116 | #ifdef OS_NT | |
117 | /* GetSystemTimeAsFileTime()'s resolution seems to be about 15 ms on Windows | |
118 | * XP and under a millisecond on Windows 7. | |
119 | */ | |
120 | FILETIME ft; | |
121 | GetSystemTimeAsFileTime( &ft ); | |
122 | timestamp_from_filetime( t, &ft ); | |
11fdf7f2 TL |
123 | #elif defined(_POSIX_TIMERS) && defined(CLOCK_REALTIME) && \ |
124 | (!defined(__GLIBC__) || (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17)) | |
125 | /* Some older versions of XCode define _POSIX_TIMERS, but don't actually | |
126 | * have clock_gettime. Check CLOCK_REALTIME as well. Prior to glibc 2.17, | |
127 | * clock_gettime requires -lrt. This is a non-critical feature, so | |
128 | * we just disable it to keep bootstrapping simple. | |
129 | */ | |
130 | struct timespec ts; | |
131 | clock_gettime( CLOCK_REALTIME, &ts ); | |
132 | timestamp_init( t, ts.tv_sec, ts.tv_nsec ); | |
7c673cae FG |
133 | #else /* OS_NT */ |
134 | timestamp_init( t, time( 0 ), 0 ); | |
135 | #endif /* OS_NT */ | |
136 | } | |
137 | ||
138 | ||
139 | int timestamp_empty( timestamp const * const time ) | |
140 | { | |
141 | return !time->secs && !time->nsecs; | |
142 | } | |
143 | ||
144 | ||
145 | /* | |
146 | * timestamp_from_path() - return timestamp for a path, if present | |
147 | */ | |
148 | ||
149 | void timestamp_from_path( timestamp * const time, OBJECT * const path ) | |
150 | { | |
151 | PROFILE_ENTER( timestamp ); | |
152 | ||
7c673cae FG |
153 | if ( file_time( path, time ) < 0 ) |
154 | timestamp_clear( time ); | |
155 | ||
156 | PROFILE_EXIT( timestamp ); | |
157 | } | |
158 | ||
159 | ||
160 | void timestamp_init( timestamp * const time, time_t const secs, int const nsecs | |
161 | ) | |
162 | { | |
163 | time->secs = secs; | |
164 | time->nsecs = nsecs; | |
165 | } | |
166 | ||
167 | ||
168 | void timestamp_max( timestamp * const max, timestamp const * const lhs, | |
169 | timestamp const * const rhs ) | |
170 | { | |
171 | if ( timestamp_cmp( lhs, rhs ) > 0 ) | |
172 | timestamp_copy( max, lhs ); | |
173 | else | |
174 | timestamp_copy( max, rhs ); | |
175 | } | |
176 | ||
177 | ||
178 | static char const * timestamp_formatstr( timestamp const * const time, | |
179 | char const * const format ) | |
180 | { | |
181 | static char result1[ 500 ]; | |
182 | static char result2[ 500 ]; | |
183 | strftime( result1, sizeof( result1 ) / sizeof( *result1 ), format, gmtime( | |
184 | &time->secs ) ); | |
185 | sprintf( result2, result1, time->nsecs ); | |
186 | return result2; | |
187 | } | |
188 | ||
189 | ||
190 | char const * timestamp_str( timestamp const * const time ) | |
191 | { | |
192 | return timestamp_formatstr( time, "%Y-%m-%d %H:%M:%S.%%09d +0000" ); | |
193 | } | |
194 | ||
195 | ||
196 | char const * timestamp_timestr( timestamp const * const time ) | |
197 | { | |
198 | return timestamp_formatstr( time, "%H:%M:%S.%%09d" ); | |
199 | } | |
200 | ||
201 | ||
7c673cae FG |
202 | /* |
203 | * free_timestamps() - worker function for freeing timestamp table contents | |
204 | */ | |
205 | ||
206 | static void free_timestamps( void * xbinding, void * data ) | |
207 | { | |
208 | object_free( ( (BINDING *)xbinding )->name ); | |
209 | } | |
210 | ||
211 | ||
212 | /* | |
213 | * timestamp_done() - free timestamp tables | |
214 | */ | |
215 | ||
216 | void timestamp_done() | |
217 | { | |
218 | if ( bindhash ) | |
219 | { | |
220 | hashenumerate( bindhash, free_timestamps, 0 ); | |
221 | hashdone( bindhash ); | |
222 | } | |
223 | } | |
224 | ||
225 | /* | |
226 | * timestamp_delta_seconds() - seconds from time a to b. | |
227 | */ | |
228 | double timestamp_delta_seconds( timestamp const * const a , timestamp const * const b ) | |
229 | { | |
20effc67 | 230 | return difftime(b->secs, a->secs) + (b->nsecs - a->nsecs) * 1.0E-9; |
7c673cae | 231 | } |